Routing choice under user control per application instance?

[S P Arif Sahari Wibowo]

Hi!

I am wondering whether it is possible to choose TCP/IP routing 
for a specific instance of an application - chosen on user-level 
when the application is started?

More specifically I have a workstation with 2 Internet 
connections (different devices), and I would like to have some 
applications connecting to Internet using one connection while 
other applications connecting to Internet using the other 
connection, where I choose which application instance use which 
connection.

I control the whole workstation (root, hardware) so I can do 
whatever on the machine, but not the router / connection.

Any idea?

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